Larus sp. ‚Saint Helena‘

Undetermined Gull (Larus sp.)

This form will be mentioned here only for the sake of completeness, because most likely it doesn’t constitute a special species. [1]

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Only a single bone fragment is known, the proximal end of a right humerus, that originates from a large gull species, but which cannot be assigned to any certain species.

Most likely this fragment is a remain of a bird that only stayed on the island as a guest. 

The most likely candidate, in my opinion, might be the Kelp Gull (Larus dominicanus Lichtenstein), which still regularly visits the islands of the Tristan da Cunha archipelago without breeding there. [1] 

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References:  

[1] S. L. Olson: Paleornithology of St. Helena Island, south Atlantic Ocean. Smithsonian Contributions to Paleobiology 23. 1975

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edited: 29.04.2021